<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
	#aaaa{
		width:720px;
	}
	#top{
		width:720px;
		height:120px;
		background-color:#FF0;
		float:left;
		margin-bottom:10px;
	}
	#left{
		width:200px;
		height:500px;
		background-color:#093;
		float:left;
		margin-right:10px;
	}
	#right{
		width:200px;
		height:500px;
		background-color:#00C;
		float:left;
	}
	#bottom{
		width:720px;
		height:120px;
		background-color:#333;
		float:left;
		margin-top:10px;
	}
	#center{
		width:300px;
		height:500px;
		background-color:#F0F;
		float:left;
		margin-right:10px;
	}
</style>
</head>

<body>
<div id="aaaa">
	<div id="top">A</div>
	<div id="left">B</div>
    <div id="center">后来者</div>
	<div id="right">C</div>
	<div id="bottom">D</div>
</div>
</body>
</html>
